Device for rolling-in tubes



H. A. T. FRENTZEL.

DEVICE FOR ROLLING IN TUBES.

APPLICATION FILED OCT. 16, I916.

Patented Dec. 21, 1928.

o a I 1 WW J, *--':ZF?'/{/?E I 6 U, E L d a HEINRICH A. TE. FREN'IZEL,OF BERLIN, GERMANY.

DEVICE FOR ROLLING-IN TUBES.

Specification of Letters Patent.

Patented Dec. 21, 15320.

Application filed October 16, 1916. Serial No. 126,009.

T 0 aZZ whom it may concern.

Be it known that I, HEINRICH A. TH. FnnNrznL, subject of the King ofPrussia, residing at Berlin, Germany, Hindersinstrasse 2, have inventedcertain new and useful improvements in Devices for Bolling-ln Tubes, ofwhich the following is a specification.

My invention relates to improvements in a device for rolling in tubes.

The object of the invention is to provide a device for rolling in tubeswhich is so constructed that by means of uniform rollers the end of thetube is flanged simultaneously with the expanding of the body thereofwhereby the end of the tube may be given any desired shape.

In the preferred form of the device according to the invention theuniformity of the rollers is obtained by differently forming the mantle.of the roller in three parts in such a manner that each end of theroller carries a conical member while the middle part is adapted to rolland form the tube. The conical members serve to give the roller therequired hold upon the conical mandrel or the like without producingconsiderable wear by the edge-contact between mandrel and roller. Themiddle part of the roller therefore need not to bear against the mandrelwhereby a great freedom with regard to the shape thereof is obtained.

In the accompanying drawings a section through a device according to theinvention is shown by way of example.

The example illustrated is based upon the well-known tube rollingmachines in which three rollers are arranged around a conical mandrel (Zlocated in a casing e. The rollers, of which only one is shown in thedrawing, each consist of the middle part c, the inner end part 0' andthe outer end part 0 The end parts 0' and 0 have 'a common generatrixwhich coincides with that of the mandrel (Z. The middle part is soshaped, that it not only expands the tube a in the flange b but that itproduces at a a flange of cambered shape.

1. In an apparatus of the class described, the combination with aconical mandrel adapted to be inserted in the end of a tube and taperingcontinuously from end to end and toward a point lying without the tube,and a casing surrounding the mandrel, of an expanding roller arranged inthe casing and comprising longitudinally tapering end sections engagingthe mandrel, the taper of said sections being reversed relatively to thetaper of the mandrel, and an intermediate section shaped tosimultaneously expand and flange the end of the tube engaged thereby.

2. In an apparatus of the class described, the combination with aconical mandrel adapted to be partially inserted in the end of a tube,and a casing surrounding the mandrel, of an expanding roller extendingwithin the casing and comprising longitudinally tapering end sections,said end sections being portions of a single cone engaging the mandrel,the taper of said sections being reversed relative to the taper of themandrel, and the section having the greater diameter lying without thecasing, and having an intermediate section shaped to simultaneouslyexpand and flange the end of the tube engaged thereby.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY HASPER, ALLEN F. JENNINGS.

